MMM cutting off prematurely

[thisguy]

Hello, I have an MMM that I am using with the CC/NEU 2200 kV motor in my HB D8T. For some reason, the ESC cuts off prematurely. I thought that perhaps my cutoff was too high so I dropped it to 3.2V per cell. I am running brand new 5s lipo 5000 mah Turnigy packs. When the pack cuts off there is still 70% left in the battery. Also, the resistance of the pack is good, 1.2 milliohms per cell. Strangely, if I let it sit for a couple of minutes it just starts to work again and will run for about another 30% of the battery. I thought maybe it is thermalling so I checked the ESC temps and they are only around 140 and of course the fan never turns on that thing. Probably a broken wire like all the MMM's I have purchased.
I have tried different gearing and right now I am using a 13T pinion with a 50T spur which should put very little to no strain on my car. I am also using the elite RC motor mount which is similar to the Losi 8/T mount.
Other things I have tried was to update the firmware and change timing settings on the ESC through castle link. No luck.
The ESC itself looks fine. It is clean and mounting on the ESC end of the Losi battery tray so it has some flex to withstand some of the harsher landings. Any help would be greatly appreciated!!